From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Shawn O. Pearce" Subject: Re: faster egit history page and a pure java "gitk" Date: Tue, 25 Mar 2008 04:09:59 -0400 Message-ID: <20080325080959.GG4759@spearce.org> References: <20080324092726.GQ8410@spearce.org> <47E8889E.6090403@intelinet.com.br> <20080325053649.GE4759@spearce.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Cc: Robin Rosenberg , git@vger.kernel.org To: "Roger C. Soares" X-From: git-owner@vger.kernel.org Tue Mar 25 09:13:00 2008 Return-path: Envelope-to: gcvg-git-2@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by lo.gmane.org with esmtp (Exim 4.50) id 1Je4F8-0001tC-0B for gcvg-git-2@gmane.org; Tue, 25 Mar 2008 09:10:50 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751647AbYCYIKH (ORCPT ); Tue, 25 Mar 2008 04:10:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751682AbYCYIKH (ORCPT ); Tue, 25 Mar 2008 04:10:07 -0400 Received: from corvette.plexpod.net ([64.38.20.226]:52016 "EHLO corvette.plexpod.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751610AbYCYIKG (ORCPT ); Tue, 25 Mar 2008 04:10:06 -0400 Received: from cpe-74-70-48-173.nycap.res.rr.com ([74.70.48.173] helo=asimov.home.spearce.org) by corvette.plexpod.net with esmtpa (Exim 4.68) (envelope-from ) id 1Je4EJ-0003Ai-Sv; Tue, 25 Mar 2008 04:09:59 -0400 Received: by asimov.home.spearce.org (Postfix, from userid 1000) id 014E020FBAE; Tue, 25 Mar 2008 04:09:59 -0400 (EDT) Content-Disposition: inline In-Reply-To: <20080325053649.GE4759@spearce.org> User-Agent: Mutt/1.5.11 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - corvette.plexpod.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - spearce.org Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: "Shawn O. Pearce" wrote: > "Roger C. Soares" wrote: > > > But it wasn't that fast, it took some minutes to finish building the > > whole tree. Also, changing projects (different git repos) makes the cpu > > go very high, and what opened fast the first time takes minutes after... Something else I noticed - the core.packedGit* settings make a difference on performance. On Windows XP with Java 6 I am getting much better performance (200 ms lower running time) by using a much smaller window size and disabling mmap: [core] packedGitWindowSize = 8k packedGitLimit = 10m packedGitMMAP = false by default jgit is using mmap, as Robin has reported it runs faster that way for him. But I have never been able to reproduce that on Mac OS 10.4/Java 5 or Windows XP/Java 6. In both systems setting mmap to false has performed better, even on the initial first set of hits to the cache where we have to read in the blocks vs. mmap them. The ByteBuffer API is just that much slower than accessing a byte[] directly when shoving it through inflate. We spend at least 30% of our time in inflate. -- Shawn.